EVIL ENERGY 5/8" Heater Hose 25 ft — EPDM Coolant Line, SAE 20R3, 100 PSI Working Pressure

EVIL ENERGY's 5/8" heater hose is a 25-foot EPDM coolant line built to SAE 20R3 standards for reliable engine cooling, heater, and overflow connections.

This hose is engineered for automotive cooling and hot-water heater use where flexibility, temperature resistance and consistent flow matter. Constructed from EPDM rubber and rated for a 100 psi working pressure, it supports common engine fluids like coolant, water and antifreeze while withstanding high temperatures and freezing conditions. The 25-foot length gives installers enough material for routing, replacement and custom trimming without multiple joins.

What are the hose dimensions and tolerances?

The hose has a nominal inner diameter (ID) of 5/8" (16 mm) and an outer diameter (OD) of 0.94" (24 mm). Manufacturing tolerances are tight: ID ±0.5 mm and OD ±0.6 mm, which helps ensure consistent fit with clamps and connectors.

• Internal diameter: 5/8" (16 mm) ±0.5 mm
• Outer diameter: 0.94" (24 mm) ±0.6 mm
• Length: 25 feet continuous

How does it perform under pressure and temperature extremes?

Designed for everyday engine bay demands, the hose has a working pressure of 100 psi and a burst rating around 300 psi for safety margin. The EPDM compound remains flexible from -40°F up to 257°F, so it resists hardening in cold weather and softening at elevated under-hood temperatures.

• Working pressure: 100 psi
• Burst pressure: approximately 300 psi
• Temperature range: -40°F to 257°F

Which fluids and applications is this hose suitable for?

This hose is compatible with coolant, antifreeze blends, water and other common engine-transfer fluids, making it suitable for radiator connections, heater cores and overflow lines. It meets SAE 20R3 (Class D-2) wall requirements, so it fits typical heater and low-pressure radiator roles rather than pressurized turbo or charge-air systems.

• Compatible media: coolant, water, antifreeze
• Typical uses: heater core lines, radiator to overflow connections, hot-water heater plumbing
• Standard compliance: SAE 20R3 (Class D-2)

How easy is it to install and maintain?

The hose’s flexibility and 25-foot length make routing and trimming straightforward for DIYers or professional shops. Its EPDM construction reduces need for frequent replacement due to ozone or coolant exposure, and standard clamp fittings work with its measured diameters.

• Pre-measured length reduces joins and potential leak points
• Flexible EPDM eases routing through tight engine bays
• Works with standard hose clamps and fittings

Who is this for: EVIL ENERGY’s 5/8" heater hose is aimed at vehicle owners, mechanics and fleet technicians who need a dependable replacement or upgrade for heater and low-pressure coolant lines. It’s particularly useful when a long, continuous length is required for routing or repairs without multiple couplings. Choose this hose if you want SAE-compliant material with wide temperature tolerance, predictable dimensions and compatibility with common engine fluids.